名校
解题方法
1 . 如图,在四棱锥
中,
底面
,底面
为菱形,
,
,过
作平面
与直线
平行,交
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/bf2ca908-4b37-49c8-b5d5-da2036cfd4b4.png?resizew=230)
(1)求证:
为
的中点;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83a04565a8ebaa111894b724b0ba266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/bf2ca908-4b37-49c8-b5d5-da2036cfd4b4.png?resizew=230)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f1787b7a6c0999d4a415616c0b75c3.png)
您最近一年使用:0次
2017-12-22更新
|
495次组卷
|
3卷引用:云南省红河州泸西一中2017─2018学年高二上学期期末考试理科数学试题
名校
2 . 在四面体
中,已知棱
的长为
,其余各棱长都为1,则二面角
的平面角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6d1c5eace748465b2dad5065f5111c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2017-12-05更新
|
2023次组卷
|
9卷引用:云南省昆明市寻甸县民族中学2019-2020学年高一下学期第一次月考数学试题
云南省昆明市寻甸县民族中学2019-2020学年高一下学期第一次月考数学试题人教A版高中数学必修二第2章 章末综合测评2【全国百强校】甘肃省兰州第一中学2018-2019学年高一上学期期末考试数学试题人教A版 全能练习 必修2 第二章+本章能力测评(二)河南省安阳市第一中学2018-2019学年高二上第二阶段考试理科数学试题黑龙江省大庆中学2019-2020学年高一下学期期末考试数学试题甘肃省兰州市东方中学2020-2021学年第一学期高二年级期中文科考试试题甘肃省兰州市兰州东方中学2020-2021学年高二上学期期中数学理科试题(已下线)第八章 立体几何初步(单元测试B卷)-2021-2022学年高一数学同步精品课件+课时作业(人教A版2019必修第二册)
3 . 如图,在直三棱柱
中,
,
,点
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/47a8cfee-5b21-48c1-aa55-334f8e134438.png?resizew=181)
(1)证明:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83beb9fd65e75633d2d5e7b010693899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38946e8e92738baf91f63f937af3d8bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/47a8cfee-5b21-48c1-aa55-334f8e134438.png?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84bd173466089f8e523dc02808239daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2da84a0e9aac2c68de71c26f2ea4761.png)
您最近一年使用:0次
2017-10-26更新
|
993次组卷
|
2卷引用:云南省昆明一中2018届高三第一次摸底测试理数试题
4 . 如图长方体中,AB=AD=2
,CC1=
,则二面角 C1—BD—C的大小为____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/d47203c5-b8a7-4962-aa6e-b9a9d8bb7c65.png?resizew=165)
您最近一年使用:0次
2017-10-24更新
|
677次组卷
|
2卷引用:云南省石林彝族自治县民族中学2019-2020学年高一6月月考数学试题
名校
5 . 如图,在斜三棱柱
中,侧面
与侧面
都是菱形,
,
.
(Ⅰ)求证:
;
(Ⅱ)若
,求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8b5a6dbcf05f572f83f51abf7d668c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea018b2d461bc24d0703fe22f65b655a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c2b3adb41e8965f553da2e5086a751.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a677b42f8b427b21924a559b90141d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb3edb9e444eb488f867bb22e57ab58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447ead7907c10dad61dd486b66831d87.png)
您最近一年使用:0次
2017-08-24更新
|
814次组卷
|
5卷引用:云南民族大学附属中学2021届高三上学期期中考试数学(理)试题
6 . 如图,已知
平面
是正三角形,
.
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050723623747584/2052752350191616/STEM/63336e7985914f1db9aa595de0ff4f55.png?resizew=181)
(1)求证:平面
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fde5b9b07b288a63f8202b11a5e7413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f779e7f5f53e4377b9a0a8e945d562.png)
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050723623747584/2052752350191616/STEM/63336e7985914f1db9aa595de0ff4f55.png?resizew=181)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
您最近一年使用:0次
2017-07-21更新
|
2364次组卷
|
5卷引用:云南省玉溪市一中2018-2019学年高二上学期第一次月考数学(理)试题
解题方法
7 . 如图所示的立体图形中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/95628e19-ab47-469a-b257-1174b380af69.png?resizew=234)
(Ⅰ)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b886a9f161fdcab1e08cba8ece5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
;
(Ⅱ)若
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d191901eb333651ffc204104d632162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4501c8139ff17fc09c10454919c1611a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/95628e19-ab47-469a-b257-1174b380af69.png?resizew=234)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b886a9f161fdcab1e08cba8ece5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a2ddd96a0b3d640dbae6767ac46725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a5a89ba08524c9b8283d73aacced38b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe76a3a5ce66947feba7b8c07b1904e.png)
您最近一年使用:0次
8 . 在等腰梯形
中,
,
,
,
是
的中点,将梯形
绕
旋转
,得到
(如图).
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572671024291840/1572671030632448/STEM/20fb14c5464248bea0945dbdc3af2409.png?resizew=180)
(I)求证:
;
(II)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4a1dc86ec008a976874c72f84c45c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3686ba2753cca5dccff70abad106c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd9c952730250617211fbede9f2d360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4da267a7227192aa6f07fa59a34c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a20a987842b48c3daa16c808b231cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5534ba448f65d4c1d52be222aace803a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4a1dc86ec008a976874c72f84c45c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48ac31e4da45e6a4a1444ec08bab8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b672ba0940ba2a3415895fd67b43eef3.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572671024291840/1572671030632448/STEM/20fb14c5464248bea0945dbdc3af2409.png?resizew=180)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d098dffcc5360fa2678d7d133c5be931.png)
(II)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dbb38e70418821fb5135c1f5d6bce0d.png)
您最近一年使用:0次
9 . 如图所示,在四棱锥PABCD中,PA⊥平面ABCD,AC⊥AD,AB⊥BC,∠BAC=45°,PA=AD=2,AC=1.
![](https://img.xkw.com/dksih/QBM/2016/1/8/1572425401917440/1572425407971328/STEM/c74046a7-0a53-4b02-ac77-d2b0bb26c8d5.png?resizew=195)
(1)证明:PC⊥AD;
(2)求二面角A-PC-D的正弦值.
![](https://img.xkw.com/dksih/QBM/2016/1/8/1572425401917440/1572425407971328/STEM/c74046a7-0a53-4b02-ac77-d2b0bb26c8d5.png?resizew=195)
(1)证明:PC⊥AD;
(2)求二面角A-PC-D的正弦值.
您最近一年使用:0次
2016-12-04更新
|
342次组卷
|
2卷引用:云南省楚雄天人中学2019-2020学年高二4月学习效果监测数学(理)试题
10 . 在三棱锥
中,
是边长为
的正三角形,平面
平面
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/84954115-debf-43ff-ad7b-fcad8338293f.png?resizew=164)
(1)求证:
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78307cd417504554a4e2276fe24d1162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4832c0f00d7ee74ab7dd5910b6a676f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/84954115-debf-43ff-ad7b-fcad8338293f.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90fa715d27ae43ec1e157226bc9dea54.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0262d3168bd3296cc63c4d78965cbb2c.png)
您最近一年使用:0次